>The way I read the above, says: > -- We're compression-crowning a soundboard panel. That normally >implies a soundboard panel dried to approximately 4.0% MC. > -- If flat ribs are pressed onto this panel against a flat surface a >given amount of crown will result as the panel absorbs moisture and returns >to a normal (for the climate) MC. > -- Given the same panel at 4.0% MC and the same flat ribs, but this >time glued up using a curved caul (surface), the finished soundboard >assembly will have the same crown when the assembly has reached the same >equilibrium MC in its normal climate. > >I disagree. With all other factors being the same, the compression-crowned >soundboard panel glued up against a curved caul/surface will end up with >more crown than the one glued up against a flat caul/surface. > >Del Hi Del, You're right, of course, all things being equal. I was assuming an appropriate adjustment in MC% with the curved caul induced crown to end up with similar final crowns, since the final crown is the presumed target. I should have been more specific. In either case, the result is, indeed, a compression crowned assembly. Ron N
This PTG archive page provided courtesy of Moy Piano Service, LLC